Abstract
Since the pores connecting the lacunae (the site of pressurisation in emergent macrophytes) with the atmosphere include the stomatal aperture, it was hypothesised that stomata may influence the effectivity of pressurisation in Typha domingensis. To investigate this, stomatal conductance and effectivity were measured over the diel period. The relative mean pore diameter was predicted using a derivative of the Poiseuille–Hagen equation, and also related to effectivity. Both the stomatal conductance and the relative mean pore diameter were found to be correlated to effectivity ( r 2 = 0.95 and 0.93, respectively) suggesting stomatal conductance did influence the ability to pressurise. As the baseline effectivity (e.g., when the stomata were fully open) was 1.4% it is suggested that while the stomatal aperture is the primary tissue involved in the ability to pressurise (contributing up to ca. 30% to the effectivity), other tissues between the lacunae and the atmosphere aid the process.
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